<template>
	<u-popup :maskCloseAble="maskCloseAble" mode="bottom" :popup="false" v-model="value" length="auto" :safeAreaInsetBottom="safeAreaInsetBottom" @close="close" :z-index="uZIndex">
		<view class="u-datetime-picker">
			<view class="u-picker-header" @touchmove.stop.prevent="">
				<view
class="u-btn-picker u-btn-picker--tips"
					:style="{ color: cancelColor }"
					hover-class="u-opacity"
					:hover-stay-time="150"
					@tap="getResult('cancel')"
				>{{cancelText}}</view>
				<view class="u-picker__title">{{ title }}</view>
				<view
					class="u-btn-picker u-btn-picker--primary"
					:style="{ color: moving ? cancelColor : confirmColor }"
					hover-class="u-opacity"
					:hover-stay-time="150"
					@touchmove.stop=""
					@tap.stop="getResult('confirm')"
				>
					{{confirmText}}
				</view>
			</view>
			<view class="u-picker-body">
				<picker-view v-if="mode == 'region'" :value="valueArr" @change="change" class="u-picker-view" @pickstart="pickstart" @pickend="pickend">
					<picker-view-column v-if="!reset && params.province">
						<view class="u-column-item" v-for="(item, index) in provinces" :key="index">
							<view class="u-line-1">{{ item.label }}</view>
						</view>
					</picker-view-column>
					<picker-view-column v-if="!reset && params.city">
						<view class="u-column-item" v-for="(item, index) in citys" :key="index">
							<view class="u-line-1">{{ item.label }}</view>
						</view>
					</picker-view-column>
					<picker-view-column v-if="!reset && params.area">
						<view class="u-column-item" v-for="(item, index) in areas" :key="index">
							<view class="u-line-1">{{ item.label }}</view>
						</view>
					</picker-view-column>
				</picker-view>
				<picker-view v-else-if="mode == 'time'" :value="valueArr" @change="change" class="u-picker-view" @pickstart="pickstart" @pickend="pickend">
					<picker-view-column v-if="!reset && params.year">
						<view class="u-column-item" v-for="(item, index) in years" :key="index">
							{{ item }}
							<text class="u-text" v-if="showTimeTag">年</text>
						</view>
					</picker-view-column>
					<picker-view-column v-if="!reset && params.month">
						<view class="u-column-item" v-for="(item, index) in months" :key="index">
							{{ formatNumber(item) }}
							<text class="u-text" v-if="showTimeTag">月</text>
						</view>
					</picker-view-column>
					<picker-view-column v-if="!reset && params.day">
						<view class="u-column-item" v-for="(item, index) in days" :key="index">
							{{ formatNumber(item) }}
							<text class="u-text" v-if="showTimeTag">日</text>
						</view>
					</picker-view-column>
					<picker-view-column v-if="!reset && params.hour">
						<view class="u-column-item" v-for="(item, index) in hours" :key="index">
							{{ formatNumber(item) }}
							<text class="u-text" v-if="showTimeTag">时</text>
						</view>
					</picker-view-column>
					<picker-view-column v-if="!reset && params.minute">
						<view class="u-column-item" v-for="(item, index) in minutes" :key="index">
							{{ formatNumber(item) }}
							<text class="u-text" v-if="showTimeTag">分</text>
						</view>
					</picker-view-column>
					<picker-view-column v-if="!reset && params.second">
						<view class="u-column-item" v-for="(item, index) in seconds" :key="index">
							{{ formatNumber(item) }}
							<text class="u-text" v-if="showTimeTag">秒</text>
						</view>
					</picker-view-column>
				</picker-view>
				<picker-view v-else-if="mode == 'selector'" :value="valueArr" @change="change" class="u-picker-view" @pickstart="pickstart" @pickend="pickend">
					<picker-view-column v-if="!reset">
						<view class="u-column-item" v-for="(item, index) in range" :key="index">
							<view class="u-line-1">{{ getItemValue(item, 'selector') }}</view>
						</view>
					</picker-view-column>
				</picker-view>
				<picker-view v-else-if="mode == 'multiSelector'" :value="valueArr" @change="change" class="u-picker-view" @pickstart="pickstart" @pickend="pickend">
					<picker-view-column v-if="!reset" v-for="(item, index) in range" :key="index">
						<view class="u-column-item" v-for="(item1, index1) in item" :key="index1">
							<view class="u-line-1">{{ getItemValue(item1, 'multiSelector') }}</view>
						</view>
					</picker-view-column>
				</picker-view>
			</view>
		</view>
	</u-popup>
</template>

<script>
import provinces from '../../libs/util/province.js'
import citys from '../../libs/util/city.js'
import areas from '../../libs/util/area.js'

/**
 * picker picker弹出选择器
 * @description 此选择器有两种弹出模式：一是时间模式，可以配置年，日，月，时，分，秒参数 二是地区模式，可以配置省，市，区参数
 * @tutorial https://www.uviewui.com/components/picker.html
 * @property {Object} params 需要显示的参数，见官网说明
 * @property {String} mode 模式选择，region-地区类型，time-时间类型（默认time）
 * @property {String Number} start-year 可选的开始年份，mode=time时有效（默认1950）
 * @property {String Number} end-year 可选的结束年份，mode=time时有效（默认2050）
 * @property {Boolean} safe-area-inset-bottom 是否开启底部安全区适配（默认false）
 * @property {Boolean} show-time-tag 时间模式时，是否显示后面的年月日中文提示
 * @property {String} cancel-color 取消按钮的颜色（默认#606266）
 * @property {String} confirm-color 确认按钮的颜色（默认#2979ff）
 * @property {String} default-time 默认选中的时间，mode=time时有效
 * @property {String} confirm-text 确认按钮的文字
 * @property {String} cancel-text 取消按钮的文字
 * @property {String} default-region 默认选中的地区，中文形式，mode=region时有效
 * @property {String} default-code 默认选中的地区，编号形式，mode=region时有效
 * @property {Boolean} mask-close-able 是否允许通过点击遮罩关闭Picker（默认true）
 * @property {String Number} z-index 弹出时的z-index值（默认1075）
 * @property {Array} default-selector 数组形式，其中每一项表示选择了range对应项中的第几个
 * @property {Array} range 自定义选择的数据，mode=selector或mode=multiSelector时有效
 * @property {String} range-key 当range参数的元素为对象时，指定Object中的哪个key的值作为选择器显示内容
 * @event {Function} confirm 点击确定按钮，返回当前选择的值
 * @event {Function} cancel 点击取消按钮，返回当前选择的值
 * @example <u-picker v-model="show" mode="time"></u-picker>
 */
export default {
  name: 'UPicker',
  props: {
    // picker中需要显示的参数
    params: {
      type: Object,
      default() {
        return {
          year: true,
          month: true,
          day: true,
          hour: false,
          minute: false,
          second: false,
          province: true,
          city: true,
          area: true,
          timestamp: true
        }
      }
    },
    // 当mode=selector或者mode=multiSelector时，提供的数组
    range: {
      type: Array,
      default() {
        return []
      }
    },
    // 当mode=selector或者mode=multiSelector时，提供的默认选中的下标
    defaultSelector: {
      type: Array,
      default() {
        return [0]
      }
    },
    // 当 range 是一个 Array＜Object＞ 时，通过 range-key 来指定 Object 中 key 的值作为选择器显示内容
    rangeKey: {
      type: String,
      default: ''
    },
    // 模式选择，region-地区类型，time-时间类型，selector-单列模式，multiSelector-多列模式
    mode: {
      type: String,
      default: 'time'
    },
    // 年份开始时间
    startYear: {
      type: [String, Number],
      default: 1950
    },
    // 年份结束时间
    endYear: {
      type: [String, Number],
      default: 2050
    },
    // "取消"按钮的颜色
    cancelColor: {
      type: String,
      default: '#606266'
    },
    // "确定"按钮的颜色
    confirmColor: {
      type: String,
      default: '#ffb403'
    },
    // 默认显示的时间，2025-07-02 || 2025-07-02 13:01:00 || 2025/07/02
    defaultTime: {
      type: String,
      default: ''
    },
    // 默认显示的地区，可传类似["河北省", "秦皇岛市", "北戴河区"]
    defaultRegion: {
      type: Array,
      default() {
        return []
      }
    },
    // 时间模式时，是否显示后面的年月日中文提示
    showTimeTag: {
      type: Boolean,
      default: true
    },
    // 默认显示地区的编码，defaultRegion和areaCode同时存在，areaCode优先，可传类似["13", "1303", "130304"]
    areaCode: {
      type: Array,
      default() {
        return []
      }
    },
    safeAreaInsetBottom: {
      type: Boolean,
      default: false
    },
    // 是否允许通过点击遮罩关闭Picker
    maskCloseAble: {
      type: Boolean,
      default: true
    },
    // 通过双向绑定控制组件的弹出与收起
    value: {
      type: Boolean,
      default: false
    },
    // 弹出的z-index值
    zIndex: {
      type: [String, Number],
      default: 0
    },
    // 顶部标题
    title: {
      type: String,
      default: ''
    },
    // 取消按钮的文字
    cancelText: {
      type: String,
      default: '取消'
    },
    // 确认按钮的文字
    confirmText: {
      type: String,
      default: '确认'
    }
  },
  data() {
    return {
      years: [],
      months: [],
      days: [],
      hours: [],
      minutes: [],
      seconds: [],
      year: 0,
      month: 0,
      day: 0,
      hour: 0,
      minute: 0,
      second: 0,
      reset: false,
      startDate: '',
      endDate: '',
      valueArr: [],
      provinces,
      citys: citys[0],
      areas: areas[0][0],
      province: 0,
      city: 0,
      area: 0,
      moving: false // 列是否还在滑动中，微信小程序如果在滑动中就点确定，结果可能不准确
    }
  },
  mounted() {
    this.init()
  },
  computed: {
    propsChange() {
      // 引用这几个变量，是为了监听其变化
      return `${this.mode}-${this.defaultTime}-${this.startYear}-${this.endYear}-${this.defaultRegion}-${this.areaCode}`
    },
    regionChange() {
      // 引用这几个变量，是为了监听其变化
      return `${this.province}-${this.city}`
    },
    yearAndMonth() {
      return `${this.year}-${this.month}`
    },
    uZIndex() {
      // 如果用户有传递z-index值，优先使用
      return this.zIndex ? this.zIndex : this.$u.zIndex.popup
    }
  },
  watch: {
    propsChange() {
      this.reset = true
      setTimeout(() => this.init(), 10)
    },
    // 如果地区发生变化，为了让picker联动起来，必须重置this.citys和this.areas
    regionChange(val) {
      this.citys = citys[this.province]
      this.areas = areas[this.province][this.city]
    },
    // watch监听月份的变化，实时变更日的天数，因为不同月份，天数不一样
    // 一个月可能有30，31天，甚至闰年2月的29天，平年2月28天
    yearAndMonth(val) {
      if (this.params.year) this.setDays()
    },
    // 微信和QQ小程序由于一些奇怪的原因(故同时对所有平台均初始化一遍)，需要重新初始化才能显示正确的值
    value(n) {
      if (n) {
        this.reset = true
        setTimeout(() => this.init(), 10)
      }
    }
  },
  methods: {
    // 标识滑动开始，只有微信小程序才有这样的事件
    pickstart() {
      // #ifdef MP-WEIXIN
      this.moving = true
      // #endif
    },
    // 标识滑动结束
    pickend() {
      // #ifdef MP-WEIXIN
      this.moving = false
      // #endif
    },
    // 对单列和多列形式的判断是否有传入变量的情况
    getItemValue(item, mode) {
      // 目前(2020-05-25)uni-app对微信小程序编译有错误，导致v-if为false中的内容也执行，错误导致
      // 单列模式或者多列模式中的getItemValue同时被执行，故在这里再加一层判断
      if (this.mode == mode) {
        return typeof item === 'object' ? item[this.rangeKey] : item
      }
    },
    // 小于10前面补0，用于月份，日期，时分秒等
    formatNumber(num) {
      return +num < 10 ? `0${num}` : String(num)
    },
    // 生成递进的数组
    generateArray(start, end) {
      // 转为数值格式，否则用户给end-year等传递字符串值时，下面的end+1会导致字符串拼接，而不是相加
      start = Number(start)
      end = Number(end)
      end = end > start ? end : start
      // 生成数组，获取其中的索引，并剪出来
      return [...Array(end + 1).keys()].slice(start)
    },
    getIndex(arr, val) {
      const index = arr.indexOf(val)
      // 如果index为-1(即找不到index值)，~(-1)=-(-1)-1=0，导致条件不成立
      return ~index ? index : 0
    },
    // 日期时间处理
    initTimeValue() {
      // 格式化时间，在IE浏览器(uni不存在此情况)，无法识别日期间的"-"间隔符号
      let fdate = this.defaultTime.replace(/\-/g, '/')
      fdate = fdate && fdate.indexOf('/') == -1 ? `2020/01/01 ${fdate}` : fdate
      let time = null
      if (fdate) time = new Date(fdate)
      else time = new Date()
      // 获取年日月时分秒
      this.year = time.getFullYear()
      this.month = Number(time.getMonth()) + 1
      this.day = time.getDate()
      this.hour = time.getHours()
      this.minute = time.getMinutes()
      this.second = time.getSeconds()
    },
    init() {
      this.valueArr = []
      this.reset = false
      if (this.mode == 'time') {
        this.initTimeValue()
        if (this.params.year) {
          this.valueArr.push(0)
          this.setYears()
        }
        if (this.params.month) {
          this.valueArr.push(0)
          this.setMonths()
        }
        if (this.params.day) {
          this.valueArr.push(0)
          this.setDays()
        }
        if (this.params.hour) {
          this.valueArr.push(0)
          this.setHours()
        }
        if (this.params.minute) {
          this.valueArr.push(0)
          this.setMinutes()
        }
        if (this.params.second) {
          this.valueArr.push(0)
          this.setSeconds()
        }
      } else if (this.mode == 'region') {
        if (this.params.province) {
          this.valueArr.push(0)
          this.setProvinces()
        }
        if (this.params.city) {
          this.valueArr.push(0)
          this.setCitys()
        }
        if (this.params.area) {
          this.valueArr.push(0)
          this.setAreas()
        }
      } else if (this.mode == 'selector') {
        this.valueArr = this.defaultSelector
      } else if (this.mode == 'multiSelector') {
        this.valueArr = this.defaultSelector
        this.multiSelectorValue = this.defaultSelector
      }
      this.$forceUpdate()
    },
    // 设置picker的某一列值
    setYears() {
      // 获取年份集合
      this.years = this.generateArray(this.startYear, this.endYear)
      // 设置this.valueArr某一项的值，是为了让picker预选中某一个值
      this.valueArr.splice(this.valueArr.length - 1, 1, this.getIndex(this.years, this.year))
    },
    setMonths() {
      this.months = this.generateArray(1, 12)
      this.valueArr.splice(this.valueArr.length - 1, 1, this.getIndex(this.months, this.month))
    },
    setDays() {
      const totalDays = new Date(this.year, this.month, 0).getDate()
      this.days = this.generateArray(1, totalDays)
      let index = 0
      // 这里不能使用类似setMonths()中的this.valueArr.splice(this.valueArr.length - 1, xxx)做法
      // 因为this.month和this.year变化时，会触发watch中的this.setDays()，导致this.valueArr.length计算有误
      if (this.params.year && this.params.month) index = 2
      else if (this.params.month) index = 1
      else if (this.params.year) index = 1
      else index = 0
      // 当月份变化时，会导致日期的天数也会变化，如果原来选的天数大于变化后的天数，则重置为变化后的最大值
      // 比如原来选中3月31日，调整为2月后，日期变为最大29，这时如果day值继续为31显然不合理，于是将其置为29(picker-column从1开始)
      if (this.day > this.days.length) this.day = this.days.length
      this.valueArr.splice(index, 1, this.getIndex(this.days, this.day))
    },
    setHours() {
      this.hours = this.generateArray(0, 23)
      this.valueArr.splice(this.valueArr.length - 1, 1, this.getIndex(this.hours, this.hour))
    },
    setMinutes() {
      this.minutes = this.generateArray(0, 59)
      this.valueArr.splice(this.valueArr.length - 1, 1, this.getIndex(this.minutes, this.minute))
    },
    setSeconds() {
      this.seconds = this.generateArray(0, 59)
      this.valueArr.splice(this.valueArr.length - 1, 1, this.getIndex(this.seconds, this.second))
    },
    setProvinces() {
      // 判断是否需要province参数
      if (!this.params.province) return
      let tmp = ''
      let useCode = false
      // 如果同时配置了defaultRegion和areaCode，优先使用areaCode参数
      if (this.areaCode.length) {
        tmp = this.areaCode[0]
        useCode = true
      } else if (this.defaultRegion.length) tmp = this.defaultRegion[0]
      else tmp = 0
      // 历遍省份数组匹配
      provinces.map((v, k) => {
        if (useCode ? v.value == tmp : v.label == tmp) {
          tmp = k
        }
      })
      this.province = tmp
      this.provinces = provinces
      // 设置默认省份的值
      this.valueArr.splice(0, 1, this.province)
    },
    setCitys() {
      if (!this.params.city) return
      let tmp = ''
      let useCode = false
      if (this.areaCode.length) {
        tmp = this.areaCode[1]
        useCode = true
      } else if (this.defaultRegion.length) tmp = this.defaultRegion[1]
      else tmp = 0
      citys[this.province].map((v, k) => {
        if (useCode ? v.value == tmp : v.label == tmp) {
          tmp = k
        }
      })
      this.city = tmp
      this.citys = citys[this.province]
      this.valueArr.splice(1, 1, this.city)
    },
    setAreas() {
      if (!this.params.area) return
      let tmp = ''
      let useCode = false
      if (this.areaCode.length) {
        tmp = this.areaCode[2]
        useCode = true
      } else if (this.defaultRegion.length) tmp = this.defaultRegion[2]
      else tmp = 0
      areas[this.province][this.city].map((v, k) => {
        if (useCode ? v.value == tmp : v.label == tmp) {
          tmp = k
        }
      })
      this.area = tmp
      this.areas = areas[this.province][this.city]
      this.valueArr.splice(2, 1, this.area)
    },
    close() {
      this.$emit('input', false)
    },
    // 用户更改picker的列选项
    change(e) {
      this.valueArr = e.detail.value
      let i = 0
      if (this.mode == 'time') {
        // 这里使用i++，是因为this.valueArr数组的长度是不确定长度的，它根据this.params的值来配置长度
        // 进入if规则，i会加1，保证了能获取准确的值
        if (this.params.year) this.year = this.years[this.valueArr[i++]]
        if (this.params.month) this.month = this.months[this.valueArr[i++]]
        if (this.params.day) this.day = this.days[this.valueArr[i++]]
        if (this.params.hour) this.hour = this.hours[this.valueArr[i++]]
        if (this.params.minute) this.minute = this.minutes[this.valueArr[i++]]
        if (this.params.second) this.second = this.seconds[this.valueArr[i++]]
      } else if (this.mode == 'region') {
        if (this.params.province) this.province = this.valueArr[i++]
        if (this.params.city) this.city = this.valueArr[i++]
        if (this.params.area) this.area = this.valueArr[i++]
      } else if (this.mode == 'multiSelector') {
        let index = null
        // 对比前后两个数组，寻找变更的是哪一列，如果某一个元素不同，即可判定该列发生了变化
        this.defaultSelector.map((val, idx) => {
          if (val != e.detail.value[idx]) index = idx
        })
        // 为了让用户对多列变化时，对动态设置其他列的变更
        if (index != null) {
          this.$emit('columnchange', {
            column: index,
            index: e.detail.value[index]
          })
        }
      }
    },
    // 用户点击确定按钮
    getResult(event = null) {
      // #ifdef MP-WEIXIN
      if (this.moving) return
      // #endif
      let result = {}
      // 只返回用户在this.params中配置了为true的字段
      if (this.mode == 'time') {
        if (this.params.year) result.year = this.formatNumber(this.year || 0)
        if (this.params.month) result.month = this.formatNumber(this.month || 0)
        if (this.params.day) result.day = this.formatNumber(this.day || 0)
        if (this.params.hour) result.hour = this.formatNumber(this.hour || 0)
        if (this.params.minute) result.minute = this.formatNumber(this.minute || 0)
        if (this.params.second) result.second = this.formatNumber(this.second || 0)
        if (this.params.timestamp) result.timestamp = this.getTimestamp()
      } else if (this.mode == 'region') {
        if (this.params.province) result.province = provinces[this.province]
        if (this.params.city) result.city = citys[this.province][this.city]
        if (this.params.area) result.area = areas[this.province][this.city][this.area]
      } else if (this.mode == 'selector') {
        result = this.valueArr
      } else if (this.mode == 'multiSelector') {
        result = this.valueArr
      }
      if (event) this.$emit(event, result)
      this.close()
    },
    // 获取时间戳
    getTimestamp() {
      // yyyy-mm-dd为安卓写法，不支持iOS，需要使用"/"分隔，才能二者兼容
      const time = `${this.year}/${this.month}/${this.day} ${this.hour}:${this.minute}:${this.second}`
      return new Date(time).getTime() / 1000
    }
  }
}
</script>

<style lang="scss" scoped>
@import '../../libs/css/style.components.scss';

.u-datetime-picker {
	position: relative;
	z-index: 999;
}

.u-picker-view {
	height: 100%;
	box-sizing: border-box;
}

.u-picker-header {
	width: 100%;
	height: 90rpx;
	padding: 0 40rpx;
	@include vue-flex;
	justify-content: space-between;
	align-items: center;
	box-sizing: border-box;
	font-size: 30rpx;
	background: #fff;
	position: relative;
}

.u-picker-header::after {
	content: '';
	position: absolute;
	border-bottom: 1rpx solid #eaeef1;
	-webkit-transform: scaleY(0.5);
	transform: scaleY(0.5);
	bottom: 0;
	right: 0;
	left: 0;
}

.u-picker__title {
	color: $u-content-color;
}

.u-picker-body {
	width: 100%;
	height: 500rpx;
	overflow: hidden;
	background-color: #fff;
}

.u-column-item {
	@include vue-flex;
	align-items: center;
	justify-content: center;
	font-size: 32rpx;
	color: $u-main-color;
	padding: 0 8rpx;
}

.u-text {
	font-size: 24rpx;
	padding-left: 8rpx;
}

.u-btn-picker {
	padding: 16rpx;
	box-sizing: border-box;
	text-align: center;
	text-decoration: none;
}

.u-opacity {
	opacity: 0.5;
}

.u-btn-picker--primary {
	color: $u-type-primary;
}

.u-btn-picker--tips {
	color: $u-tips-color;
}
</style>
